We found that the BLT studios were the smallest on property. As others have said, if you want a real kitchen you'll need a 1 bedroom unit or higher. You're responsible for restocking utensils and such as they only clean every 4 days. Laundry rooms are available on each floor or every other floor, I can't recall. I did use them on a trip there as we had babies at the time and needed to wash clothes. If you want a W/D in unit then you'll have to go 1 bedroom or higher. Personally, when we've done 2+ week trips we stayed in 1 bedroom units. Having the full kitchen an in room W/D was worth it to us, as was the extra space.
I do not know if you're staying on points or not, but another option for more space and full kitchen (but no in room W/D) are the cabins at Ft. Wilderness. Not a DVC property but nice and spacious.